from what I understand, which is little, from reading between the lines of news broadcasts is that the exclusion of almost 2 million people from the citizens register in Assam is because of illegal immigration from Bangladesh, which would make sense as they would have no right to citizenship.

History (divide India into a Muslim nation and a Hindu nation because they did not live happily together) -

[en.wikipedia.org]

Today "Since Narendra Modi came to power in May 2014 the level of religious persecution of Christians has gone up dramatically. Every year more violent incidents are registered, mainly because the government is looking the other way."- India's persecution of Christians has gone from about 20th in the world to the 10th worst under Modi's Hindu Nationalist agenda. Muslims share an even larger portion of the Indian population (15%+/-) and no doubt receive their share of persecution from the Hindu majority.

I had no idea that the Buddhists had such a small percentage share in India.

[opendoorsusa.org]

So certainly not all.

The idea that a multi-ethnic or multi-religious state can achieve relative peace is seemingly not a natural progression. People of all religions living happily together - yeah, just think of that "neighbor" we all have. So no, that's happy talk unless you're proposing to lace all of the drinking water with Lithium.